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DIN 137 (A) - 1987 Curved spring washers
Bare Steel DIN 6319 (D) - 2001 Spherical Washers, Conical Seats - TypeD
DIN 6319 (C) - 2001 Spherical Washers, Conical Seats - Type C
Heavy Hex Nuts are larger and thicker than standard (finished) hex nuts.The heavy hex pattern is typically used for large diameter and high strength bolts, and with certain high-strength grades of steel can be used with structural bolts in structural applications
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